Screening apparatus



Oct. 18, 1932'.

M. P. REYNOLDS 1,882,908

SCREENING APPARATUS Filed Sept. 15. 1930 IN VEN TOR.

7770116 fimsolz Fcyno/c/s BY I A TTORNEY Patented Oct. 18, 1932 UNITEDSTATES PATENT OFFICE MORLEY PUNSHON REYNOLDS, OF CLEVELAND, HEIGHTS,OHIO, ASSIGNOR TO THE W. s TYLER COMPANY, OF CLEVELAND, OHIO, ACORPORATION OF OHIO SCREENING APPARATUS Application filed September 13,1930. Serial No. 481,715.

The present invention, relating as indicated to screening apparatus, ismore particularly directed to a new and improved screen unit for use inscreening apparatus, the unit consisting of a section of woven wirescreen provided with a reinforcing strip of a new and improved typeassociated therewith along two opposite edges of the screen section. Theprincipal object of the invention is the pro vision of a screen sectionor unit of the character referred to which may be employed in aninclined screening apparatus in which the screen is supported at its topand bottom edges, to secure a marked increase in uniformity of vibrationand an increase in-the stiffness of the screen along the reinforcededges. Other features of the invention will appear hereinafter andinclude an increased capacity and convenience for nesting for shipment,an increased resistance to distortion or bulging and other features.

To the accomplishment of the foregoing and related ends, said invention,then, consists of the means hereinafter fully described and particularlypointed out in the claims the annexed drawing and the followingdescription setting forth in detail certain mechanism embodying theinvention, such disclosed means constituting, however, but one ofvarious mechanical forms in which the principle of the invention may beused.

In said annexed drawing V Fig. 1. 's a side elevation partially insection of an inclined screening apparatus in which my new screensection is incorporated; Fig. 2 is a plan view of the screen section;Fig. '3 is a section on the line 33, Fig. 2; Fig. 4 is a section similarto Fig. 8, but showing a modification of the reinforcing means for thescreen section; and Fig. 5 is a similar view showing still anothermodification.

Referring now to Fig. 1, I have shown a screening apparatus consistingof a rectangular box-like casing 1 mounted on suitable supports 2 and 3which may, if desired, be adjustable for varying the angle of thescreen. It will also be understood of course that my improved screensection may be employed in other types of apparatus than that hereshown, which I have shown merely for consection is mounted within'thebox-like casing '1 as at 4: in Fig. 1 and is provided with hookshapedstrips 5 clamping over both upper and lower ends for attachmentto angles6, one or both of which is adj ustably mounted in the casing fortensioning the woven wire screen 7, which is supported between thehook-like strips 5 in the usual manner.

My improved screen unit consists of a woven wire screen 7, (see Fig. 2)provided with hook-shaped engaging strips 5 along two opposite sides, inthis case the top and bottom edges, andwith reinforcing or vibrationdistributin members 10 disposed along the other two e ges 11 and 12.These edges are unsupported in that they are not mounted or fixed to anyportion of the casing. These 1 vibration distributing members consist ofa strip or sheet of metal 10 bent into the form illustrated in Fig. 3,that is, provided with two approximately parallel flange portions 13 and14, which engage against the upper and lower edges of the screen,respectively, to which they are secured by bolts 15 and nuts 15a. Attheir outer edges the flange portions 13 and 14 merge into a channelelement 16 extending upwardly at an obtuse angle to the plane of thescreen, this resistant but resilient portion of the strip acting tostiflen and support the otherwise unsupported edges of the screen and tovery effectively transmit vibration imparted at one or more points ofthe screen surface to all portions of the screen.

It will of course be understood that various means for impartingvibrations to the screen surface may be employed, such for example as anelectro-magnetic vibrator 20 mounted on the top of the casing 1 providedwith an armature secured to a bracket 22, which is in turn secured to astrip 23 extending transversely of the screen. The vibrations of thearmature 21 are thus imparted to the screen, and, in the ordinaryapparatus of the type in use up to the present time, are transmittedthrough the screen surface in the form' of waves, the amplitude of whichis usually the maximum at the point of attachment of the armature and aminimum at either fixed edge of the screen surface. The

result is a lack of uniformity of vibration over the screen surface anda loss of efiiciency in the screen.

The metal strip 10 possesses certain peculiar advantages arising fromthe angular relationship and relative length of the two legs 16a and 16b(s-ee'Fig. The outer and inner legs 16?) and 16a, respectively, of thisstrip are of different length and the center of curvature ofthe lowercurved portions 30 and 31 are not of the same radial line. By reason ofthis relationship the two legs cannot bend in unison or about the sameaxis since their outer ends are integrally connected. The result is anextreme stifi'ness and rigidity in the reinforcing strip and acorresponding strength in the edge portions of the screen which preventsagging and permit of uniform transmission of vibration throughout thescreen surfaces. A further advantage of the present construction is thefinished quality of the unsecured edges of the screen. Screens areordinarily secured at two opposite edges, leaving the other two edgesfree and these edges ordinarily present a ragged and sometimes dangeroussurface for handling. The present construction encloses these surfaces,preventing any possibility of injury to workmen or operators duringchanging, adjusting or other handling of the screen sections.

My improved screen section has the effect of greatly increasing theuniformity of vibration over the entire screening area, therebymaterially increasing the efficiency and accuracy of the machine. Otheradvantages of my improved construction are the strength of thereinforcing section which allows the sections to retain their originalform during the life of the screen and the resistance which these bentsections give to the screen edges, thus preventing the bulging andsagging, and increasing the effective life of the screen itself. Theheight of the vibration distributing elements increases the capacity ofthe screen sections, preventing leakage or spillage over the side edgesand make it unnecessary to employ any packing strips to prevent leakage.An additional advantage lies in the form of the elements or side boards,as they may be called, which permits screen sections thus reinforced tobe nested conveniently and compactly for shipment. When so nested theyare protected from any clamage.

In Fig. 4 I have shown a modified type of reinforcing means for the edgeof the screen. In this form of my invention the screen 25 is reinforcedalong two opposite edges by angular members 26. Each of these memberscomprises two legs 27 and 28, the leg 27 being secured against the edgeof the screen by bolts, rivets or the like, which pass through this legof the angle and through a second plate 29 disposed on the lower edge ofthe screen. The other leg 28 of the angle extends upwardly at a slightobtuse angle to the plane of the screen and corresponds with theupwardly extending portions 10 and 16 of the construction shown in Fig.3.

In Fig. 5 I have shown still another modification in which the screen 30is provided with an upturned edge portion 31 which is reinforced by arebent U-shaped strip 32 of metal, which lies against and-encloses theangularly bent portion of the screen and the adjacent flat portion. Thisenclosing strip 32 isapplied by being first secured over the edges ofthe screen, after which the screen and strip are bent as a unit into theform shown in Fig. 5, the strip being secured to the screen by anysuitable means.

It will be understood that for most uses I employ the construction shownin Fig. 3, but that for certain conditions and for certain types ofscreens either of the reinforcing means of Figs. l or 5 may be used.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed. 1

I therefore particularly point out and distinctly claim as my invention.

1. In a vibratory screening mechanism, a woven wire screen supportedalong opposite edges, and a vibration distributing element secured toand extending throughout one free edge thereof, said element consistingof a formed metallic plate having its two edges secured above and belowthe free edge of said screen and having its body portion extendingupwardly from said screen at an angle to the plane thereof.

2. In a vibratory screening mechanism, a woven wire screen supportedalong opposite edges and-vibration distributing means associated withand extending throughout the free edges of said screen comprisingangularly related screen edge portions, and rebent U- shaped metalstrips engaging over and secured to said edge portions. 7

Signed by me, this 9th day of September, 1930.

MORLEY .PUNSHON REYNOLDS.

